How to calibrate PS2 controller with Radioshack USB adapter?

Hey everyone this racing community looks great. First let me start by saying i'm fairly experienced with modding game files using the NHL2004 rebuilt mods. But I seem to be having a basic problem of configuring my controls in Racer

Issue:
When I downloaded the free Racer game sim I can't figure our how to calibrate a PS2 controller with Radioshack USB adapter in this game...

How do you do it? I also have a Logitech Ruble Pad controller which looks the same. Either one would be fine to use but I don't understand how to set the values for acceleration... braking, turn left/right, shift up/down ect...